How to use a Red/Green color map in Blender?
Try inverting the image before connecting to the Normal Map Node to get back the purple (tangent space) colors (and map) you're used to seeing (color not shown).

However, looking more closely, I'm assuming the eyelids and nostrils are supposed to be protruding from the &quot;outwards&quot; face (hard to tell using the low res sample). If this is how you need it to be, you may also need to do a DirectX to OpenGL conversion: